[Problem] To provide a raw material steel sheet for providing a high strength nonmagnetic austenitic stainless steel material that has a high elastic limit stress and excellent toughness. [Solution to Problem] An austenitic stainless steel sheet containing 0.12% or less of C, from 0.30 to 3.00% of Si, from 2.0 to 9.0% of Mn, from 7.0 to 15.0% of Ni, from 11.0 to 20.0% of Cr, and 0.30% or less of N, and further containing at least one kind of 3.0% or less of Mo, 1.0% or less of V, 1.0% or less of Nb, 1.0% or less of Ti, and 0.010% or less of B, all in terms of percentage by mass, with the balance of Fe and unavoidable impurities, having a component composition having a Ni equivalent of 19.0 or more, having a value of d.sup.1/2 of 0.40 or more, wherein d (m) represents an average austenitic crystal grain diameter, and having a property that provides a magnetic permeability of 1.0100 or less after subjected to cold rolling with an equivalent strain of 0.50 or more.

[Problem] To provide a raw material steel sheet for providing a high strength nonmagnetic austenitic stainless steel material that has a high elastic limit stress and excellent toughness. [Solution to Problem] An austenitic stainless steel sheet containing 0.12% or less of C, from 0.30 to 3.00% of Si, from 2.0 to 9.0% of Mn, from 7.0 to 15.0% of Ni, from 11.0 to 20.0% of Cr, and 0.30% or less of N, and further containing at least one kind of 3.0% or less of Mo, 1.0% or less of V, 1.0% or less of Nb, 1.0% or less of Ti, and 0.010% or less of B, all in terms of percentage by mass, with the balance of Fe and unavoidable impurities, having a component composition having a Ni equivalent of 19.0 or more, having a value of d.sup.1/2 of 0.40 or more, wherein d (m) represents an average austenitic crystal grain diameter, and having a property that provides a magnetic permeability of 1.0100 or less after subjected to cold rolling with an equivalent strain of 0.50 or more.

A precipitation hardenable, martensitic stainless steel alloy is disclosed. The alloy has the following composition in weight percent, about

TABLE-US-00001 C 0.03 max Mn 1.0 max Si 0.75 max P 0.040 max S 0.020 max Cr 10-13 Ni 10.5-11.6 Mo 0.25-1.5 Co 0.5-1.5 Cu 0.75 max Ti 1.5-1.8 Al 0.3-0.8 Nb 0.3-0.8 B 0.010 max N 0.030 max
The balance is iron and usual impurities. The disclosed alloy provides a unique combination of corrosion resistance, strength, and toughness.

A steel alloy for a bearing, the alloy having a composition comprising: (a) from 0.5 to 0.9 wt. % carbon, (b) from 1.2 to 1.8 wt. % silicon, (c) from 1.1 to 1.7 wt. % manganese, (d) from 0.7 to 1.3 wt. % chromium, (e) from 0.05 to 0.6 wt. % molybdenum, and optionally any of: (f1) from 0 to 0.25 wt. % nickel, (f2) from 0 to 0.02 wt. % vanadium, (f3) from 0 to 0.05 wt. % aluminium, (f4) from 0 to 0.3 wt. % copper, (f5) from 0 to 0.5 wt. % cobalt, (f6) from 0 to 0.1 wt. % niobium, (f7) from 0 to 0.1 wt. % tantalum, (f7) from 0 to 150 ppm nitrogen, (f8) from 0 to 50 ppm calcium, and (f9) the balance iron, together with any unavoidable impurities, wherein the steel alloy has a microstructure comprising bainitic ferrite and retained austenite, and a hardness (Vickers) of at least 650 HV.

Provided is a prehardened steel material containing: 0.05?C?0.25 mass %, 0.01?Si?1.00 mass %, 0.40?Mn?1.80 mass %, 0.0002?S?0.3000 mass %, 0.30?Cu?1.80 mass %, 2.00?Ni?3.90 mass %, 0.05?Cr?3.20 mass %, 0.05?Mo?0.80 mass %, and 0.30?Al?1.50 mass %, with a balance being Fe and unavoidable impurities, in which the prehardened steel material has: a cross-sectional size of 350 mm or more in width and 350 mm or more in height, a hardness of 34 to 43 HRC, an average value of prior austenite grain size being 85 ?m or less, and an average value of impact value being 18 J/cm.sup.2 or higher.

A method of manufacturing a turbine blade, the method comprising forming a forging by forging stainless steel; heat treating the forging; and cooling the forging after the heat treatment; wherein in the heat treatment and the cooling, a plurality of the forgings are arranged in alignment, and adjacent forgings of the plurality of forgings are disposed so that at least respective portions of portions of the adjacent forgings corresponding to a region from a portion corresponding to a platform of a turbine blade to a center in a longitudinal direction of the turbine blade face each other and warm each other via radiant heat.

An objective of the invention is to provide an austenitic stainless steel article having superior irradiation resistance and stress corrosion cracking resistance than before while maintaining mechanical properties equivalent to those of conventional ones. There is provided a dispersion strengthened austenitic stainless steel article, including: 16-26 mass % of Cr; 8-22 mass % of Ni; 0.005-0.08 mass % of C; 0.002-0.1 mass % of N; 0.02-0.4 mass % of O; at least one of 0.2-2.8 mass % of Zr, 0.4-5 mass % of Ta, and 0.2-2.6 mass % of Ti; and a balance consisting of Fe and inevitable impurities. The Zr, Ta and Ti components form inclusion particles in the stainless steel article by combining with the C, N and O components. The stainless steel article has an average grain size of 1 m or less and a maximum grain size of 5 m or less.

An objective of the invention is to provide an austenitic stainless steel article having superior irradiation resistance and stress corrosion cracking resistance than before while maintaining mechanical properties equivalent to those of conventional ones. There is provided a dispersion strengthened austenitic stainless steel article, including: 16-26 mass % of Cr; 8-22 mass % of Ni; 0.005-0.08 mass % of C; 0.002-0.1 mass % of N; 0.02-0.4 mass % of O; at least one of 0.2-2.8 mass % of Zr, 0.4-5 mass % of Ta, and 0.2-2.6 mass % of Ti; and a balance consisting of Fe and inevitable impurities. The Zr, Ta and Ti components form inclusion particles in the stainless steel article by combining with the C, N and O components. The stainless steel article has an average grain size of 1 m or less and a maximum grain size of 5 m or less.

Provided is a heat-resistant ferritic steel having a chemical composition containing, by mass %, C: 0.07 to 0.14%, Si: 0.15 to 0.35%, Mn: 0.30 to 0.55%, P: 0.0250% or less, S: 0.0030% or less, Ni: 0.15 to 0.35%, Cr: 8.0 to 9.7%, Mo: 0.20 to 0.60%, W: 1.50 to 2.30%, V: 0.16 to 0.25%, Nb: 0.020 to 0.120%, B: 0.0010 to 0.0050%, N: 0.010 to 0.080%, Al: 0.020% or less, and O: 0.020% or less, with the balance Fe and impurities, wherein V.sub.ER, i.e., the V content (mass %) in precipitates obtained by extracted residue analysis satisfies [?0.2?C+0.060?V.sub.ER??0.1?C+0.160].

A tool steel as well as a method for manufacturing a tool steel for cold-work and/or high-speed-work applications, in particular as an intermediate product for manufacturing cold-work and/or high-speed-work tools with a PVD coating, consisting of the following alloying elements: (all amounts expressed in wt %): C=0.55 to 0.75 Si=0.70 to 1.00 Mn=0.20 to 0.50 Cr=4.00 to 5.00 Mo=1.80 to 3.50 V=0.80 to 1.50 W=1.80 to 3.00 Co=3.00 to 5.00 N=0.02 to 0.10 and optionally one or more of Ni?1.5 Cu?1.0 Ti?1.5 Nb?1.5 Ta?1.5 Hf?1.5 Zr?1.5 Al?1.5 B?0.8 S?0.35 P?0.35 and residual iron and inevitable smelting-related impurities.